from django.shortcuts import render
from django.views.generic import TemplateView

from commodity.models import CommodityInfos, Types


# Create your views here.
def indexView(request):
    """
    处理首页请求
    """
    title = "首页" #页面标题
    #当前网页为首页的时候，首页的class = 'active'
    #当前页为所有商品的时候，对应的class= ’active‘
    classContent = "" #用于页面样式控制变量
    #获取销量最高的8个商品，按照销量降序排列
    commodityInfos = CommodityInfos.objects.order_by("-sold").all()[:8]
    #获取所有的商品分类
    types = Types.objects.all()
    #筛选儿童服饰分类下的二级分类
    c1 = [x.seconds for x in types if x.firsts =='儿童服饰']
    #获取儿童服饰分类下销量最高的5个商品
    clothes = CommodityInfos.objects.filter(types__in=c1).order_by("-sold").all()[:5]
    # 筛选奶粉辅食分类下的二级分类
    f1 = [x.seconds for x in types if x.firsts =='奶粉辅食']
    #获取奶粉辅食分类下销量最高的5个商品
    food = CommodityInfos.objects.filter(types__in=f1).order_by("-sold").all()[:5]
    # 筛选儿童用品分类下的二级分类
    g1 = [x.seconds for x in types if x.firsts =='儿童用品']
    # 获取儿童用品分类下销量最高的5个商品
    goods = CommodityInfos.objects.filter(types__in=g1).order_by("-sold").all()[:5]
    #将所有变量传递给模版进行渲染
    return render(request,'index.html',locals())
#基于类的视图，处理首页请求，功能和indexView相同
class indexClassView(TemplateView):
    #制定渲染模版
    template_name = 'index.html'
    #可选，制定模版引擎
    template_engine = None
    #额外的模版上下文的变量
    extra_context = {'title':'首页','classContent' : ''}
    #重写获取上下文的方法
    def get_context_data(self, **kwargs):
        #获取父类的上下文
        context = super(indexClassView,self).get_context_data(**kwargs)
        #获取销量最高的8个商品
        context['commodityInfos'] = CommodityInfos.objects.order_by('-sold').all()[:8]
        #获取所有商品分类
        types = Types.objects.all()
        c1 = [x.seconds for x in types if x.firsts == '儿童服饰']
        context['clothes'] = CommodityInfos.objects.filter(types__in=c1).order_by('-sold')[:5]
        f1 = [x.seconds for x in types if x.firsts == '奶粉辅食']
        context['food'] = CommodityInfos.objects.filter(types__in=f1).order_by('-sold')[:5]
        g1 = [x.seconds for x in types if x.firsts == '儿童用品']
        context['goods'] = CommodityInfos.objects.filter(types__in=g1).order_by('-sold')[:5]
        return context
    def get(self,request,*args,**kwargs):
        """
        处理HTTP GET 请求
        request 代表HTTP请求信息
        如果路由设置了路由变量，那么可以从参数Kwargs中获取
        """
        #获取上下文数据
        context = self.get_context_data(**kwargs)
        #渲染模版并返回响应
        return self.render_to_response(context)
    def post(self,request,*args,**kwargs):
        context = self.get_context_data(**kwargs)
        return self.render_to_response(context)
def page_not_found(request,exception):
    return render(request,'404.html',status = 404)
def page_error(request):
    return render(request,'404.html',status = 500)